Several vulnerabilities have been discovered in Iceweasel, a webbrowser based on Firefox. The included XULRunner library providesrendering services for several other applications included in Debian.

CVE-2012-1937

Mozilla developers discovered several memory corruption bugs, which may lead to the execution of arbitrary code.

CVE-2012-1940

Abhishek Arya discovered a use-after-free problem when working with column layout with absolute positioning in a container that changes size, which may lead to the execution of arbitrary code.

CVE-2012-1947

Abhishek Arya discovered a heap buffer overflow in utf16 to latin1 character set conersion, allowing to execute arbitray code.

Note: We'd like to advise users of Iceweasel's 3.5 branch in Debianstable to consider to upgrade to the Iceweasel 10.0 ESR (ExtendedSupport Release) which is now availble in Debian Backports.Although Debian will continue to support Iceweasel 3.5 in stable withsecurity updates, this can only be done on a best effort base asupstream provides no such support anymore. On top of that, the 10.0branch adds proactive security features to the browser.

For the stable distribution (squeeze), this problem has been fixed inversion 3.5.16-16.

For the unstable distribution (sid), this problem has been fixed inversion 10.0.5esr-1.

We recommend that you upgrade your iceweasel packages.

Further information about Debian Security Advisories, how to applythese updates to your system and frequently asked questions can befound at: http://www.debian.org/security/